The attraction of computer-based crime is obvious. Twenty years ago corporate spies would find it difficult to steal the entire contents of a filing cabinet, but today they can take far more by slipping a disc into their pocket or e-mailing data to an online electronic swag bag. It is much easier to steal, leak, manipulate or destroy electronic data. But just as in the physical world, cyber-criminals leave their electronic fingerprints all over a digital crime scene.

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